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Work, Energy and power — Revision Notes

ICSE · Class 10 · Physics

Work, Energy and power revision notes for ICSE Class 10 Physics: 4 topics in quick points. Part of the ICSE Class 10 Physics syllabus.

43 questions36 flashcards10 formulas & key relations5 concepts

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An illustration showing a block being pulled by a constant force F at an angle theta to the horizontal displacement S, with the formula W = F ⋅ S = FS cosθ.
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Key Topics to Revise

1

Work and its Measurement

  • Work is done only when a body is displaced under the influence of an applied force.
  • If there is no displacement even when a force acts, work done is zero.
  • Work is a scalar quantity, while force and displacement are vector quantities.
2

Units of Work

  • The SI unit of work is joule.
  • One joule is the work done by a force of one newton in displacing a body by one metre.
  • The CGS unit of work is erg.
3

Power and its Units

  • Rate of doing work is known as power.
  • Power depends on the amount of work done and the time taken.
  • Smaller the time taken for the same work, greater is the power.
4

Energy and Units of Energy

  • Energy is the capacity to do work.
  • When a body is capable of doing work, it possesses energy.
  • When work is done on a body, its energy increases.

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Full Notes

Key Concepts

Work is done when a bodyWork is maximum and positive whenThe SI unit of workPower is the rate of doingThe SI unit of power

Frequently Asked Questions

What are the important topics in Work, Energy and power for ICSE Class 10 Physics?
Key topics in Work, Energy and power include Work and its Measurement, Units of Work, Power and its Units, Energy and Units of Energy. Study these first, then practise questions on each for the ICSE Class 10 board exam.
How should I revise Work, Energy and power for the ICSE Class 10 board exam?
Learn the core ideas first, then work through the 43 practice questions on Work, Energy and power. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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